Exhibit 32.1

                            CERTIFICATION PURSUANT TO
                             18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002



     In  connection  with the  Quarterly  Report  of  Calpine  Corporation  (the
"Company") on Form 10-Q for the period ending  September 30, 2004, as filed with
the Securities and Exchange  Commission on the date hereof (the "Report"),  each
of the  undersigned  does hereby  certify,  pursuant to 18 U.S.C.  ss. 1350,  as
adopted pursuant to ss. 906 of the Sarbanes-Oxley Act of 2002, that, to the best
of his knowledge, based upon a review of the Report:

     (1) The Report fully  complies  with the  requirements  of Section 13(a) or
15(d) of the Securities Exchange Act of 1934; and

     (2)  The  information  contained  in the  Report  fairly  presents,  in all
material  respects,  the  financial  condition  and results of  operation of the
Company.


/s/ Peter Cartwright                         /s/ Robert D. Kelly
---------------------------                  ---------------------------
Peter Cartwright                             Robert D. Kelly
Chairman, President and                      Executive Vice President and
Chief Executive Officer                      Chief Financial Officer
Calpine Corporation                          Calpine Corporation


Dated:  November [__], 2004


A signed  original of this  written  statement  required by Section 906 has been
provided to Calpine  Corporation and will be retained by Calpine Corporation and
furnished to the Securities and Exchange Commission or its staff upon request.